Online presentations are in Adobe PDF or Microsoft PowerPoint format. You can download an open source viewer
for PowerPoint files (it is the Impress application, part of Open Office, which is a large download) from
www.openoffice.org.
Alternatively, Microsoft make available a free PowerPoint viewer for Windows
ppview.exe (2.8 MB).
A reader for PDF can be downloaded from the
Adobe Acrobat Reader page .